In a large bowl toss the cubed eggplant and peppers with garlic, salt, pepper, and olive oil. Add a dash of oregano, if desired.
Transfer the vegetables to two lined sheet pans (you’re looking to give the veggies lots of elbow room, so they brown properly; if you crowd them they’ll steam).
Roast in a thin layer for 20-30 minutes, or until softened and browning.
Immediately toss in a bowl with chopped tomatoes.
Add lemon juice and more olive oil, to taste. Check seasonings.